Table 3

Associations between the sensitivity of the rapid antigen test compared with the PCR test and the duration from the onset of symptoms to testing, vaccination status, kit manufacturer, sample type of PCR or test type during the Omicron variant outbreak among players and staff members of the Japan Professional Football League and clubs

ItemsRapid antigen: +
PCR: +
Rapid antigen: −
PCR: +
Sensitivityφ or Cramer’s VP value
Duration from the onset of symptoms to testing−2 days*310.750.1460.837†
−1 day*530.63
0 day20160.56
1 day1250.71
2 days540.56
Asymptomatic2090.69
VaccinationYes43270.610.2200.073†
No990.50
Unknown1320.87
Test typeRegular23130.640.0120.904‡
Voluntary42250.63
  • *‘−2 days’ and ‘−1 day’ represent cases that were asymptomatic at the time of tests but subsequently developed symptoms.

  • †Fisher’s exact test

  • ‡χ2 test.